FR3092116A1 - Improved matte paint composition - Google Patents

Abstract

The invention relates to a base composition for painting, more particularly a mat paint, tintable and exhibiting particularly improved resistance to abrasion, polishing, marking and / or tracing. Said composition comprises in particular, as a percentage by dry weight relative to the total weight of the composition wet, a.) Up to 15%, preferably from 5 to 15% of binder; b.) fillers of which b.1) 1 to 15%, preferably 2 to 10% of inorganic spherical fillers with a median diameter between 2 and 12 µm, and b.2) 3 to 15%, preferably 3 to 13% of organic spherical fillers with a median diameter between 10 to 40 µm. The invention also relates to an average base composition and to a paint obtained from the preceding composition and to the use of said composition for the manufacture of a paint, in particular a matt paint.

Description

Improved Flat Paint Composition

The invention relates to a base composition for paint, more particularly a matt, tintable paint having a particularly improved resistance to abrasion, buffing, marking and/or tracing. The invention also relates to a paint obtained from the preceding composition and to the use of said composition for the manufacture of a paint, in particular a matte paint. The paint according to the invention is particularly intended to be applied to building facades and/or walls, in particular interior walls.

The paints are classified according to four finishes: very matte, matte, satin or gloss. These finishes correspond to a gloss index, the latter relating to the amount of light that the paint can reflect. Thus, the more matt the paint, the less light it reflects.

The matt paint, being almost without reflection, has the advantage of concealing or, at the very least, of attenuating the irregularities of the supports. On the other hand, the matte finish is particularly appreciated for its aesthetic, sober and felted side. On the other hand, it has two major drawbacks: it is very often poorly washable, in particular because of its low resistance to wet abrasion and is, moreover, particularly lustrable during friction or frequent and/or high intensity stresses and this especially since the paint has a dark or sustained tint. Thus, matt type paints are generally recommended only for rooms with little exposure to domestic life or for ceilings which are generally out of reach of attacks.

New matt paints are now being developed to overcome the above drawbacks.

Document EP 2 754 699 A1 describes a coating base for paints, in particular for matt paints having a low “writing effect”, that is to say a low propensity for marking/tracing. The coating base proposed comprises in particular at least one polymer binder and solid particles with an average diameter of between 50 and 200 μm. Mixtures of inorganic fillers and organic fillers have been tested and did not show good results in terms of resistance to marking/tracking.

Document EP 2 942 376 A1 relates to an emulsion paint comprising 10 to 60% by weight of binder, 40 to 90% by weight of solid fillers having a bimodal distribution, in particular solid fillers with a median diameter of between 40 and 150 µm and others a median diameter between 1 and 30 µm, and less than 5% by weight of soft fillers.

Document EP 3 272 817 A1 describes an aqueous coating composition that can be used as an emulsion paint for interiors or exteriors, matt and having good resistance to the writing effect. The composition comprises 5-30% dry weight by weight of polymer with an average particle size of 60-300 nm, 0.5-8% by dry weight of matting agent with an average size of 0.5-9 µm, 2 to 30% by dry weight of organic filler and 30 to 70% by weight of water. The preferred composition for obtaining high resistance to mechanical effects (low writing effect) comprises a styrene acrylate polymer having an average particle size of 100 to 150 μm, an organic filler corresponding to a cross-linked polyurethane, having a size average of 28 to 33 µm and a matting agent, in particular polymethylurea, having an average particle size of 2 to 6 µm.

There are also paint compositions on the market such as the Kera Paint Premium product, PROFITec, comprising fillers from 0.5 to 100 µm and allowing to obtain a matt paint with improved resistance to glossing. However, this product has poor resistance to wet abrasion.

Technical problem

There is therefore a need to develop a paint with a matte or even ultra-matte finish, in particular with high resistance to polishing in white, in pastel, bright or deep tones, this paint can thus be applied in premises with heavy traffic. where there is a risk of significant friction. More particularly, there is a need for these matt paints applied in premises with heavy traffic to present, in addition to a high resistance to marking and tracing, an improved resistance to wet abrasion.

The invention improves the situation.

1. jusqu’à 15%, préférentiellement de 5 à 15% de liant ;
2. des charges comprenant :
   b.1.) 1 à 15%, préférentiellement 2 à 10% de charges sphériques inorganiques de diamètre médian compris entre 2 et 12 µm,
   b.2.) 3 à 15%, préférentiellement 3 à 13% de charges sphériques organiques de diamètre médian compris entre 10 à 40 µm ; et
   - jusqu’à 75% en poids d’eau par rapport au poids total de la composition en humide.

A basic paint composition is proposed comprising:
- as a percentage by dry weight relative to the total weight of the wet composition,

1. up to 15%, preferably from 5 to 15% of binder;
2. charges including:
   b.1.) 1 to 15%, preferably 2 to 10% of inorganic spherical fillers with a median diameter between 2 and 12 µm,
   b.2.) 3 to 15%, preferably 3 to 13% of organic spherical fillers with a median diameter of between 10 to 40 μm; and
   - up to 75% by weight of water relative to the total weight of the wet composition.

1. jusqu’à 15%, préférentiellement 5 à 15% de liant ;
2. des charges comprenant :
   b.1) 1 à 15%, préférentiellement 2 à 10% de charges sphériques inorganiques de diamètre médian compris entre 2 et 12 µm,
   b.2) 3 à 15%, préférentiellement 3 à 13% de charges sphériques organiques de diamètre médian compris entre 10 à 40 µm ;
   b.3) jusqu’à 10%, préférentiellement jusqu’à 8%, plus préférentiellement encore jusqu’à 6% d’au moins un agent opacifiant ou/et blanchissant et
   - jusqu’à 75% en poids d’eau par rapport au poids total de la composition en humide.

According to another aspect, there is proposed an average base composition for paint comprising:
- as a percentage by dry weight relative to the total weight of the wet composition,

1. up to 15%, preferably 5 to 15% of binder;
2. charges including:
   b.1) 1 to 15%, preferably 2 to 10%, of inorganic spherical fillers with a median diameter of between 2 and 12 µm,
   b.2) 3 to 15%, preferably 3 to 13%, of organic spherical fillers with a median diameter of between 10 to 40 μm;
   b.3) up to 10%, preferably up to 8%, even more preferably up to 6% of at least one opacifying and/or whitening agent and
   - up to 75% by weight of water relative to the total weight of the wet composition.

According to another aspect, a paint composition obtained from the previous base composition is proposed.

According to another aspect, there is proposed a paint composition obtained from the previous base composition further comprising up to 16% by volume of pigment paste(s), preferably up to 14% by volume and more preferably up to 12% by volume.

According to yet another aspect, a use of the above base composition for the manufacture of a paint, preferably a matte paint, is proposed.

The characteristics exposed in the following paragraphs can, optionally, be implemented. They can be implemented independently of each other or in combination with each other:

There is thus proposed a base composition for paint in which the binder is chosen from acrylic, styrene-acrylic, vinyl or alkyd resins, or resins based on polyurethane or comprising polyurethane dispersions, taken alone or in combination.

According to one embodiment, the binder is an acrylic resin, preferably a styrene acrylic resin.

According to one embodiment, the composition comprises from 3 to 7% by dry weight of inorganic spherical fillers relative to the total of the wet composition.

Advantageously, the inorganic spherical fillers have a median diameter comprised between 2 and 6 μm, preferentially between 3 and 5 μm.

Preferably, the inorganic spherical fillers are chosen from silicate beads, preferably glass beads and ceramic beads, taken alone or in combination.

According to one embodiment, the composition comprises from 3 to 7%, preferably from 4 to 6% by dry weight of organic spherical fillers relative to the total weight of the wet composition or from 7 to 15%, preferably from 8 to 12 % by dry weight of organic spherical fillers relative to the total weight of the wet composition.

Advantageously, the organic spherical fillers have a median diameter comprised between 15 and 35 μm, preferentially between 22 and 30 μm.

Preferably, the organic spherical fillers are chosen from polyurethane beads, polyacrylate or polymethacrylate beads, taken alone or in combination.

According to one embodiment, the organic spherical fillers are non-dehydrated polyurethane dispersions.

The composition may also comprise up to 8%, preferably 6%, even more preferably 4% by dry weight relative to the total wet weight of the composition of additives, preferably of additives chosen from waxes, matting agents , siloxane additives, thickeners, coalescing agents, anti-sedimentation agents, wetting agents, emulsifiers, film-forming aids, preservatives, biocides, anti-foaming agents, dispersants and anti-foam additives. -rust, taken alone or in combination.

The composition may also further comprise up to 10% by dry weight of matting filler relative to the total weight of the base wet composition, preferably up to 5%, more preferably up to 3%.

Other characteristics, details and advantages of the invention will appear on reading the detailed description below, and on analyzing the appended figures, in which:

Fig. 1

corresponds to photographs illustrating the labeling/tracing test for
b) an ultramatt paint having good resistance to marking/tracing, this is sample 1 of examples 1 and 2;
a) an ultramatt paint with poor resistance to marking/tracing, it is a sample with the same formulation as the previous sample 1 except for the fillers which are calcium carbonate and baryta sulphate fillers , non-spherical and irregular in shape.

The drawings and the description below contain, for the most part, certain elements. They may therefore not only be used to better understand the present invention, but also contribute to its definition, if necessary.

In the context of the present description and, unless otherwise stated, the term “one” or “one”, “at least one” or “at least one” respectively.

The invention relates to a composition for matte paint, more preferably for ultra-matte paint, also called “deep matte”.
According to the gloss index or specular gloss or gloss, paints are classified according to four finishes (NF EN 13300 – Feb. 2002): very matt, matt, satin and gloss. The gloss index corresponds to the ability of a surface to reflect light. The calculation of the gloss index is standardized (NF EN ISO 2813: 2014) and determined according to the method described in the ISO 2813: 2014 standard which specifies a method for determining the gloss index of coatings according to three geometries: 20°, 60° or 85°. A 60° geometry means, for example, that to determine the gloss index, light is projected onto the paintwork at an angle of 60° and the amount of reflected light is then measured.
The gloss index is indicated in gloss units (GU) and is calculated on a scale ranging from 0 to 100 GU. The gloss index is calculated either at 60° (BS 60°) for gloss and satin finishes, or at 85° (BS 85°) for satin and matt finishes.
According to the standard, a paint is matt when its gloss index under 85° is between 5 and 10 GU and very matt when it is between 0 and 5.
In the context of the present invention, we are interested in paints usually called ultra matt or “deep matt” for which the gloss index under 85° is advantageously less than or equal to 2 GU.

Matt and ultra-matt paints are generally particularly sensitive to buffing. Thus, after rubbing, the gloss index of the paint film is increased. In the context of the present invention, the gloss resistance is evaluated using a DIN 53778 type wet abrasion device. A 150 μm layer of paint is applied to a Leneta wet abrasion card. (PVC black scrub panel card described in the ISO 11998: 2006 standard, typically P121-10N card - Labomat Essor). After 7 days of drying at 23°C (± 2°C) and 50% (±5%) relative humidity, the gloss index of the non-gloss film is measured (average of three measurements). The paint film is then subjected to a cycle of 100 round trips with a brush, equipped with a single-use lint-free cotton cloth, placed on the wet abrasion device. The gloss index of the film thus polished is measured again (average of three measurements). The difference between the gloss index at 60° and at 85° before and after polishing is calculated, respectively ∆BS Glossing 60° and ∆BS Glossing 85°. The smaller this difference, the more resistant the paint is to buffing.

Paints, especially matt and ultra matt paints, are generally particularly sensitive to marking and tracing. In order to evaluate marking and tracing, a 150 µm layer of paint is applied to a contrast card (typically Penopac 1A type card – Leneta Co. or Byko Chart 2814 - Folio). After 24 hours of drying at 23°C (± 2°C) and 50% (±5%) relative humidity, the marking test is carried out blind and repeated at least 3 times for each film of paint. The test is as follows:
- we draw a line on the film by exerting pressure with the finger then with the nail,
- a score between 0 and 5 is assigned (0 – no mark or trace on the film / 5 – significant mark or trace on the film) to each film, the score for a film corresponds to the average of the various tests carried out (at least 3 attempts for each sheet). Figure 1 illustrates the results obtained using this marking/tracing test.

Paints, in particular paints for wall coverings, are also characterized by their resistance to wet abrasion. The latter corresponds to the resistance of the paint film to repeated washing and is determined according to the ISO 11998 standard. Thus, the more a paint is resistant to wet abrasion, the less there is loss of thickness of the paint film during with a damp rub.

There are five wet abrasion resistance classes:
[Table 1]
Classification Loss of film thickness Class 1 less than 5µm at 200 rubs Class 2 between 5 and 20 µm at 200 rubs Class 3 between 20 and 70 µm at 200 rubs Class 4 less than 70 µm at 40 rubs Class 5 greater than 70 µm at 40 rubs A Class 1 wet scuff resistant paint means that its paint film loses less than 5 µm at 200 wet scrub cycles.
The resistance to wet abrasion makes it possible overall to evaluate the suitability of the paint for cleaning.
In the context of the present invention, the paint will be considered resistant to wet abrasion during a loss of film thickness of less than 20 μm (class 2), preferably less than 5 μm (class 1), continued the previously described wet abrasion test.

Unless otherwise stated, definitions in ISO 1514: “ Paints and varnishes — Standard panels for testing”, ISO 2808: “ Paints and varnishes — Determination of film thickness” and ISO 4618:2014: “ Paints and varnishes — Terms and definitions” apply .

The size (diameter, distribution) of the particles is evaluated by laser granulometry according to the ISO 13320 standard. The median diameter and the particle size distribution of the particles (for example the d50, corresponding to 50% of the particles whose size is less than the value indicated ) are parameters well known to those skilled in the art.

According to the present invention, it has been discovered that a paint base composition comprising in particular a binder and a combination of organic and inorganic spherical fillers of selected median diameter makes it possible to produce a matte paint, preferably a "deep matte" finishing paint. “, tinted or not, having a particularly improved resistance in terms of polishing, marking and / or tracing, said paint being furthermore resistant to wet abrasion.

Unless otherwise stated, the term "base composition" means a transparent base composition for paint, that is to say a composition not comprising any pigment, pigment paste or opacifier.

When specified, the base composition may be a medium base composition. Such an average base composition comprises, in addition to the compounds of the transparent base composition, up to 10%, preferably up to 8%, more preferably still up to 6% by dry weight relative to the wet composition of at least least one opacifying and/or whitening agent.

The transparent or medium base compositions are in particular the formulations in which the composition can be supplied to the distributors who will subsequently make a possible addition of pigment(s) adapted to the specific request of the customer. Typically, up to 16% by volume of pigment paste(s) are added to the transparent or medium base composition, preferably up to 14% by volume and more preferably up to 12% by volume. The term "pigment paste" (or dye) is understood to mean a composition containing one or more pigments. Generally, a pigment paste comprises one or more organic or mineral pigments (or coloring agents), ground and dispersed in a typically aqueous or oily base.

The base composition for paint according to the invention comprises,
- up to 15%, preferably 5 to 15% in percentage by dry weight relative to the total weight of the base composition in wet form; binder;
- expenses including:
i) 1 to 15%, preferably 2 to 10% by dry weight relative to the total wet weight of the base composition, of inorganic spherical fillers with a median diameter of between 2 and 12 μm;
ii) 3 to 15%, preferably 3 to 13% by dry weight relative to the total wet weight of the base composition, of organic spherical fillers with a median diameter of between 10 and 40 μm; and
- up to 75% by weight of water relative to the total weight of the wet composition.

The binder of the composition according to the invention can be chosen from
-resins, in particular acrylic, styrene-acrylic, vinyl and alkyd resins, preferably in emulsion,
- polyurethanes (PU), polyurethane dispersions (PUD), taken alone or in combination. In the case of a combination of binders, it may be a combination of resins based on PUD and acrylic.
According to a preferred embodiment, the binder comprises at least one or is an acrylic binder. The acrylic binder may in particular be an acrylic resin or an acrylic styrene resin. In particular, the binder can be an acrylic binder such as, for example, the ENCOR 2710 product marketed by Arkema (ES 41.5-43.5%, TMFF<5°C, particle size 100 nm, pH 8-9, Tg = 10° C.) or, more particularly, a copolymer based on acrylic and methacrylic acid esters, such as for example the product POLIDISP®778 marketed by the company Resiquimica, SA In a preferred embodiment, the binder is an acrylic styrene binder such as for example UCAR LATEX DL420G marketed by DOW (ES 48-50%, TMMF~20°C, Tg=24°C). Such a styrene-acrylic binder makes it possible to improve the resistance to wet abrasion and in particular makes it possible to obtain a class 1 composition for resistance to wet abrasion.

The base composition comprises up to 15% by dry weight of binder relative to the total wet weight of the composition, preferably from 5 to 15% by dry weight, more preferably still from 5 to 14% or even from 8 to 12 % by dry weight. A high amount of resin in the composition generally provides better abrasion resistance. However, the present inventors have also observed that the gloss index at 60° and/or 85° of the base composition, tinted or not, can be particularly improved in the specific and critical quantities mentioned above.

The composition further comprises fillers, in particular it comprises organic and inorganic spherical fillers. Such a combination of fillers makes it possible in particular to improve the resistance to tracing and marking of the paints produced from the composition.

The inorganic spherical fillers have a specific and critical median diameter comprised between 2 and 12 μm, preferentially between 2 and 6 μm, more preferentially still between 3 and 5 μm. In a particularly advantageous embodiment, the inorganic spherical fillers have a distribution such that:
- 0.1 μm ≤ d10 ≤ 2 μm, preferably 0.5 μm ≤ d10 ≤ 1.5 μm;
- 2 μm ≤ d50 ≤ 6 μm, preferably 3 μm ≤ d50 ≤ 5 μm; and
- 15 μm ≤ d90 ≤ 25 μm, preferably 17 μm ≤ d90 ≤ 23 μm.
The inorganic spherical fillers are present in the composition at a rate of 1 to 15% by dry weight relative to the total weight of the basic wet composition, preferably from 2 to 10% and even more preferably between 3 and 7% by dry weight. relative to the total weight of the base wet composition.
The inorganic spherical fillers are advantageously chosen from silicate beads, advantageously silicate beads whose decomposition temperature is greater than 900° C., preferably glass beads and ceramic beads, taken alone or in combination. According to an advantageous embodiment, these are ceramic balls. The inventors have surprisingly demonstrated that, in particular in the absence of any filler other than the organic and inorganic spherical fillers of the present invention, the ceramic balls make it possible to obtain the best results in terms of resistance to tracing and at marking
Organic spherical fillers have a specific median diameter between 10 and 40 µm. Advantageously, their median diameter is between 15 and 35 μm, or even 22 and 30 μm. In a particularly advantageous embodiment, the organic spherical fillers have a distribution such that 15 μm ≤ d50 ≤ 35 μm, preferentially 22 μm ≤ d50 ≤ 30 μm, and d100 ≤ 150 μm, preferentially d100 ≤ 120 μm. In an advantageous embodiment compatible with the preceding modes, the median diameter (d50) of the organic spherical fillers is greater than that of the inorganic spherical fillers.
The median diameter of the organic fillers selected allows in particular an excellent resistance to tracing and marking. In addition, such a median diameter makes it possible to obtain a matt or even ultra-matt paint, the gloss index, in particular the gloss index at 85° being particularly reduced.
They are present in the composition in the amount of 3 to 15% by dry weight relative to the total weight of the base composition in wet form, preferably from 3 to 13% by dry weight relative to the total weight of the base composition in wet form. . In a first embodiment, the amount of organic spherical fillers in the composition is between 3 and 7% by dry weight, preferably between 4 and 6% by dry weight relative to the total weight. In another embodiment, the amount of organic spherical fillers in the composition is between 7 and 15% by dry weight, preferably between 8 and 12% by dry weight relative to the total weight. The amount of specific and critical organic spherical fillers in particular particularly influences the gloss index of the paint resulting from the present composition.
The organic spherical fillers are advantageously chosen from polyurethane (PU) beads, polyacrylate (PA) or polymethacrylate beads, in particular crosslinked polymethyl methacrylate (PMMA) beads, taken alone or in combination. According to a preferred embodiment, these are polyurethane dispersions (PUD). Excellent results have been obtained using non-dehydrated hollow polyurethane dispersions.

In one embodiment, the composition is substantially free of lamellar fillers. By "substantially free" is meant an amount of less than 5% by dry weight relative to the total weight of the base composition in wet form, preferably less than 3% and, more preferably even less than 1% or even less than 0, 5% or even 0.1% by dry weight relative to the total weight of the base composition in wet.

The base composition may also comprise up to 8%, preferably 6%, even more preferably 4% by dry weight relative to the total weight of the wet composition of additives, preferably of additives chosen from waxes, matting agents, siloxane additives, thickeners, coalescing agents, anti-sedimentation agents, wetting agents, emulsifiers, film forming aids, preservatives, biocides, antifoaming agents, dispersants and additives anti-rust (or anti-flash rust) effect, taken alone or in combination. The wax makes it possible in particular to reduce the gloss index of the composition and gives a smoother appearance to the paint film. The siloxane additives notably provide resistance to dry polishing.
In a particular embodiment, the composition also comprises up to 10% by dry weight of matting filler relative to the total weight of the base composition in wet form, preferably up to 5%, more preferably up to 3% . The term “matting filler” is understood here to mean a compound making it possible to reduce the gloss index of the paint obtained from the composition.
The matting filler may be chosen from organic or mineral matting fillers, it may in particular be a combination of fillers of different nature or type. According to an advantageous embodiment, the matting filler is a polycondensed plastic powder, preferably a polycondensed plastic powder whose particles are such that 5 μm≤d50≤7 μm and 13 μm≤d90≤14 μm. As a particular preference, it is a polycondensed methylene-diamino-ethyl ether, for example Deuteron MK marketed by the company Deuteron GmbH. Such a matting filler makes it possible in particular, in the particular composition according to the invention, to reduce the gloss index while maintaining good marking, tracing and polishing properties.

In an advantageous embodiment, the composition comprises:
_ 1 to 15% by dry weight of inorganic spherical fillers relative to the total weight of the basic wet composition, preferably from 2 to 10% and even more preferably between 3 and 7%;
_ 3 and 7% by dry weight of organic spherical fillers relative to the total weight of the basic wet composition, preferably between 4 and 6%;
_ up to 10% by dry weight relative to the total weight of the base composition in wet matting filler, preferably up to 5%, more preferably from 0.5 to 3%.

In another advantageous embodiment, the composition comprises in particular:
_ 1 to 15% by dry weight of inorganic spherical fillers relative to the total weight of the basic wet composition, preferably from 2 to 10% and even more preferably between 3 and 7%;
_ 7 and 15% by dry weight of organic spherical fillers relative to the total weight of the basic wet composition, preferably between 8 and 12%;
_ less than 5% by dry weight relative to the total weight of the base composition in wet matting filler, preferably less than 1%, more preferably still less than 0.5% or even less than 0.25%.

In a particularly advantageous embodiment, the base composition has:
_ a gloss index below 85°, BS 85°, less than 2;
_ class 2 wet abrasion, preferably class 1;
_ optionally a resistance to polishing such that ΔBS 85° is less than 0.2.

The transparent or medium base compositions are in particular the formulations in which the composition can be supplied to the distributors who will subsequently make a possible addition of pigment(s) adapted to the specific request of the customer. Typically, 16% by volume of pigment paste(s) are added to the transparent or medium base composition, preferably up to 14% by volume and more preferably up to 12% by volume.

The average basic paint composition includes:
- up to 15%, preferably 5 to 15%, as a percentage by dry weight relative to the total weight of the wet composition, of binder;
- expenses including:
i) 1 to 15%, preferably 2 to 10%, as a percentage by dry weight relative to the total weight of the wet composition, of inorganic spherical fillers with a median diameter of between 2 and 12 μm,
ii) 3 to 15%, preferably 3 to 13%, as a percentage by dry weight relative to the total weight of the wet composition, of organic spherical fillers with a median diameter of between 10 and 40 μm;
up to 10%, preferably up to 8%, even more preferably up to 6%, as a percentage by dry weight relative to the total weight of the wet composition, of at least one opacifying and/or bleaching agent and
up to 75% by weight of water relative to the total weight of the wet composition.

The transparent or medium base composition described above makes it possible to obtain a paint composition, in particular a matt or even ultra-matt paint, particularly intended to be applied to building facades and/or walls, preferably on interior walls.

The base composition, transparent or medium, described above is preferably usable for the development of a matt and tintable paint. Said paint is particularly intended to be applied to building facades and/or walls, in particular interior walls.

Other objects and advantages of the invention will appear on reading the particular embodiments exemplified below and given by way of non-limiting examples.

Examples

All the examples are produced with an untinted transparent base composition (TA) or tinted with a shade T2130-4 (dark shade, reference from the Totem color chart by Tollens) of composition (1UM = 0.65 mL):
_ preparation of a matte base composition: Composition Quantity
(% by weight wet relative to the total weight of the composition wet ) Quantity
(% by dry weight relative to the total weight of the wet composition ) Water Qsp 100 - Additives (excluding thickeners) 3.3 1.1 Thickeners 6-8 1 – 3 ENCOR 2710 from Arkema* 28.8 12.2
*Except for samples 13, 20 (POLIDISP7788) and 21 (UCAR LATEX DL420G)
The paint formula is obtained from this basic formula to which the various fillers are added according to the ratios indicated below in tables 3, 4 and 6.
The T2130-4 shade is produced using the following method:
_ addition in 0.93L of each paint formula of 18.5UM of AR43; 42.1 MU of UB05; 8 MU of AW41; 39.7UM of UV08 (1UM = 0.65mL). AR43, UB05, AW41 and UV08 are pigment pastes from Cromology.

Example 1

The impact of the fillers, in particular in terms of chemical nature and d50 (µm), on the gloss index at 60 and 85°, the luster, the properties of resistance to wet abrasion and resistance to scratching a been evaluated for the matte transparent base composition previously described.
The characteristics of the different fillers used are given in Table 3 as well as the results relating to the properties of interest.
Type of charges d50 ( µm ) Sample 1 Sample 2 (reference) Sample 3
(reference) Sample 4 (reference) Sample 5 (reference) VS loads (amount indicated in% by dry weight relative to the total weight of the wet composition) W410 (3M) ceramic 4 5 Sphaerawet TR25
(Lamberti) PUD ¹
(microphone-
spheres ^# ) 26 4.9 4.9 Sphaerawet TR7F
(Lamberti) PUD¹ (microphone-
spheres^#) 7 3.5 3.5 W610 (3M) ceramic 10 7 Spheriglass
7025 (Potters) glass 10 5 Spheriglass 2000 (Potters) glass 32 7 Spherome CA10 (Microbeads) PMMA ² 10 5 Spherome CA20 (Microbeads) PMMA ² 20 7 Properties BS (60/85°) TA ^§ (UB) 3.2/0.7 4.2/2.4 5.3/1.4 3.1/0.7 2.5/1.2 BS (60/85°) T2130 ^{- £} 4 (UB) 2.3/0.7 3.4/3.6 4.6/1.9 1.5/0.8 0.9/1.2 ∆BS Buffing 60° +0.1 -0.3 -0.2 0 0 ∆BS Buffing 85° +0.1 +0.9 +0.1 +0.3 +0.5 Wet abrasion (loss of thickness in µm) 7.4 3.6 3.9 12.7 12.3 Scratch resistance* 1 4 4 1 2

¹ PU: polyurethane; ² PMMA: polymethyl methacrylate; *Assignment of a score between 0 and 5 (0 – no marking or trace on the film / 5 – significant mark or trace on the film); ^# undehydrated polyurethane dispersions; ^§ Evaluation carried out with a sample of an untinted transparent base composition (TA); ^£ Evaluation carried out with a sample of a base composition tinted with a shade T2130-4 (dark shade, reference of the Totem color chart by Tollens) of composition (1UM=0.65 mL).

Sample 1 exhibits an excellent combination of properties. Sample 2 has a high gloss index as well as a high sensitivity to polishing and scratching. Sample 3, which also has a higher gloss index, is sensitive to scratching but has good resistance to wet abrasion. Samples 4 and 5 show less resistance to wet abrasion and buffing.

Example 2

The impact of fillers and additives on the gloss index at 60 and 85°, the luster, the properties of resistance to wet abrasion and resistance to scratching were evaluated for the transparent matte base composition described above. .
The nature of the fillers and additives used are given in Table 4 as well as the results relating to the properties of interest.
[Table 4]
Expenses Additives Properties W410 ³ SPHERA-WET TR25 ⁴ SPHERA-WET TR15 ⁵ DEUTERON ^MK6 CO-
ATHYLENE ⁷ BS (60/85°) TA ^§
(UB) BS (60/85°) T2130 ^{- £} 4
(UB) ∆BS Buffing 60° ∆BS Buffing 85° Wet abrasion (loss of thickness in µm) scratch resistance % by dry weight relative to the total weight of the wet composition KeraPaint Premium ¹ 2.3/0.9 0.3/0.8 0.3 30 Sample 6 5 9.9 2.4/0.6 0.6/0.6 0 0 0 Sample 7 5 7 2.7/0.6 1.2/0.6 -0.1 0.3 1 Sample 1 5 4.9 3.2/0.7 2.3/0.7 0.1 0.1 7.4 1 Sample 8 5 4.9 1 2.4/0.6 0.7/0.5 0 0.3 8.8 1 Sample 9 3 8.4 2.6/0.6 1.0/0.6 0 0.35 1 Sample 10 3 4.9 3.7/0.6 2.5/0.7 -1.2 -1.9 1 Sample 11 5 9.9 2.4/0.5 0.5/0.6 - - 8.6 0 Sample 12 5 4.9 1 2.4/0.6 1.1/0.7 0 0.3 7.4 1 Sample 13 5 4.9 1 2.6/0.7 1.1/0.7 0 0.4 0 Sample 14 5 4.9 1 2.6/0.6 0.9/0.6 1 Sample 15 3 2.5 2.5 3.2/1.0 2.0/1.1 8 0 Sample 16 5 4.9 1 3.6/0.6 1.8/0.7 8.5 2 Sample 17 5 4.9 1 2 2.4/0.5 0.7/0.5 3 Sample 18 6 4.2 1 2.6/0.7 1.1/0.7 -0.4 0.4 10.5 2 Sample 19 5 4.9 2 2.2/0.7 0.5/0.5 6.9 2 Sample 21 5 4.9 1 2.7/0.7 1.1/0.7 0 +0.2 4.6 1

¹ KeraPaint Premium (KeraPaint Premium IFP 1369) is a deep matt paint with a transparent base marketed by the company PROFITEC; ³ W410 corresponds to ceramic balls (d50 = 4 µm); ⁴ Sphaerawet TR25 corresponds to hollow PUD beads (d50 = 26 µm); ⁵ Sphaerawet TR15 corresponds to PUD beads (d50 = 15 µm); ⁶ Deuteron MK, marketed by Deuteron GmbH, is a matting filler; it is a polycondensed plastic such that d50=6.3 μm, d90=13.8 μm; ⁷ Coathylene is a high density polymer thermoplastic powder. ^§ Evaluation carried out with a sample of an untinted transparent base composition (TA); ^£ Evaluation carried out with a sample of a base composition tinted with a shade T2130-4 (dark shade, reference of the Totem color chart by Tollens) of composition (1UM=0.65 mL).
Samples 6 and 11 exhibit intense mattness (BS (60/85°) TA and T2130-4 particularly low), good scratch resistance and, for sample 6, very good resistance to polishing. Sample 10 has a high gloss index below 60°. The addition of Deuteron MK does not degrade the good scratch resistance properties and very slightly degrades the gloss resistance while providing a better mattness according to samples 8, 12. Coathylene degrades the scratch resistance , according to samples 16 and 17. Sample 21 was produced based on a styrene acrylic binder (UCAR LATEX DL420G, DOW). It shows excellent results, in particular an even more improved resistance to wet abrasion compared to sample 1.

Example 3

The impact of the binder on the gloss index at 60 and 85° of the tinted transparent base composition (Shade 2130-4, Totem Tollens color chart) or not tinted, the gloss, the scratch resistance properties were evaluated for the matte transparent base composition described above (sample 1), this same transparent base composition in which the binder (fine-particle acrylic resin, more particularly Encor® 2710 marketed by the company Arkema (ES 41.5-43.5% , TMFF<5°C, particle size 100 nm, pH 8-9) was replaced by a conventional acrylic resin (sample 20, acrylic resin: Polidisp® 7788 marketed by the company Resiquimica, ES 49-51%, Tg approximately 10 °C, TMFF<5°C, particle size approximately 0.10 microns) The results are shown in Table 5.
[Table 5]
BS 60° untinted
(UB) BS 85° untinted (UB) BS 60° tinted (UB) BS 85° tinted (UB) ∆BS Buffing 60° ∆BS Buffing 85° Tracking * Sample 1 3.2 0.7 2.3 0.7 0.1 0.1
1 Sample 20 2.6 0.7 0.9 0.7 0 0.4
1/2

*Assignment of a score between 0 and 5 (0 – no marking or trace on the film / 5 – significant mark or trace on the film)

Example 4

Excellent results have in particular been obtained with the composition detailed in Table 6. The basic composition relating to the composition below corresponds to sample 21 of example 2 above.
[Table 6]
Composition Quantity (% by weight in wet relative to the total weight of the composition in wet ) Water 56.3 Defoamer 0.1 Neutralizing agent 0.1 biocide 0.3 dispersant 0.3 Wetting agent 0.8 Additive with immediate anti-rust effect 3 Ceramic balls W-410 5 Sphaerawet TR25 (dry matter: 70%) 7 DEUTERON MK 1 UCAR LATEX DL 420G 21.7 Coalescer 1.6 Defoamer 0.1 Newtonian associative thickener 1 Mid-shear associative thickener 0.8 Thickener, anti-sedimentation 0.3 Cellulose thickener 0.6

For convenience, the following patent document(s) is (are) cited:
- patcit1: EP2754699A1;
- patcit2: EP2942376A1; and
- patcit3: EP3272817A1..

Claims (16)

Basic paint composition comprising:
- as a percentage by dry weight relative to the total weight of the wet composition,

1. up to 15%, preferably from 5 to 15% of binder;
2. charges including:

b.1) 1 to 15%, preferably 2 to 10%, of inorganic spherical fillers with a median diameter of between 2 and 12 µm,
b.2) 3 to 15%, preferably 3 to 13%, of organic spherical fillers with a median diameter of between 10 to 40 μm; and

• up to 75% by weight of water relative to the total weight of the wet composition.

Composition according to Claim 1, in which the binder is chosen from acrylic, styrene-acrylic, vinyl or alkyd resins, or resins based on polyurethane or comprising polyurethane dispersions, taken alone or in combination. Composition according to Claim 2, in which the binder is an acrylic resin, preferably an acrylic resin or an acrylic styrene resin. Composition according to any one of the preceding claims comprising from 3 to 7% by dry weight of inorganic spherical fillers relative to the total of the composition in wet form. Composition according to any one of the preceding claims, in which the inorganic spherical fillers have a median diameter of between 2 and 6 µm, preferably between 3 and 5 µm. Composition according to any one of the preceding claims, in which the inorganic spherical fillers are chosen from silicate beads, preferably glass beads and ceramic beads, taken alone or in combination. Composition according to any one of the preceding claims, comprising from 3 to 7%, preferentially from 4 to 6% by dry weight of organic spherical fillers relative to the total weight of the composition in wet form, or from 7 to 15%, preferentially from 8 to 12% by dry weight of organic spherical fillers relative to the total weight of the wet composition. Composition according to any one of the preceding claims, in which the organic spherical fillers have a median diameter of between 15 and 35 µm, preferably between 22 and 30 µm. Composition according to any one of the preceding claims, in which the organic spherical fillers are chosen from polyurethane beads, polyacrylate or polymethacrylate beads, taken alone or in combination. Composition according to Claim 9, in which the organic spherical fillers are non-dehydrated polyurethane dispersions. Composition according to any one of the preceding claims further comprising up to 8%, preferably 6%, more preferably still 4% by dry weight relative to the total wet weight of the composition of additives, preferably of additives chosen from waxes, matting agents, siloxane additives, thickeners, coalescing agents, anti-sedimentation agents, wetting agents, emulsifiers, film forming aids, preservatives, biocides, antifoaming agents, dispersants and additives with an anti-rust effect, taken alone or in combination. Composition according to any one of the preceding claims, further comprising up to 10% by dry weight of matting filler relative to the total weight of the base composition in wet form, preferably up to 5%, more preferably up to 3% . Medium base composition for paint comprising:

• in percentage by dry weight relative to the total weight of the wet composition,
  at. up to 15%, preferably 5 to 15% of binder;
  b. charges including:
  b.1) 1 to 15%, preferably 2 to 10%, of inorganic spherical fillers with a median diameter of between 2 and 12 µm,
  b.2) 3 to 15%, preferably 3 to 13%, of organic spherical fillers with a median diameter of between 10 to 40 μm;
  b. 3) up to 10%, preferably up to 8%, even more preferably up to 6% of at least one opacifying and/or whitening agent and
• up to 75% by weight of water relative to the total weight of the wet composition.

Paint composition obtained from the base composition according to any one of the preceding claims. Paint composition according to claim 14 further comprising up to 16% by volume of pigment paste(s), preferably up to 14% by volume and more preferably up to 12% by volume. Use of the composition according to any one of Claims 1 to 13 for the manufacture of a paint, preferably a matte paint.